Lyman line opacities in tokamak divertor plasmas under high-recycling and detached conditions
Radiation transport simulations of the deuterium Lyman line series using EIRENE predict a factor of 2 increase of Balmer-α emission in the JET-ILW low confinement divertor plasmas in high-recycling and detached conditions caused by the re-absorption of Lyman-β emission. The photon tracing model in t...
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Elsevier
2024-12-01
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| Series: | Nuclear Materials and Energy |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179124002175 |
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| author | Ray Chandra Detlev Reiter Niels Horsten Mathias Groth |
| author_facet | Ray Chandra Detlev Reiter Niels Horsten Mathias Groth |
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| description | Radiation transport simulations of the deuterium Lyman line series using EIRENE predict a factor of 2 increase of Balmer-α emission in the JET-ILW low confinement divertor plasmas in high-recycling and detached conditions caused by the re-absorption of Lyman-β emission. The photon tracing model in the EIRENE code is applied to SOLPS-ITER pure deuterium plasma solutions of JET-ILW to evaluate the contribution of Lyman-β capture towards the population density of D(p=3) and, consequently, the Balmer-α emission. The local population escape factors of Lyman-α and Lyman-β lines in the JET-ILW divertor show steep spatial gradients and indicate local regions with high opacity in high-recycling and detached conditions. The relative contribution of Lyman-β capture towards the population density of D(p=3) is significant in high-recycling and detached conditions. This observation is further corroborated by line-integrated calculations using Balmer-α diagnostic line-of-sights. |
| format | Article |
| id | doaj-art-7f8fb5aa9e714e8d8e49d7b4ae434e08 |
| institution | OA Journals |
| issn | 2352-1791 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
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| series | Nuclear Materials and Energy |
| spelling | doaj-art-7f8fb5aa9e714e8d8e49d7b4ae434e082025-08-20T02:34:59ZengElsevierNuclear Materials and Energy2352-17912024-12-014110179410.1016/j.nme.2024.101794Lyman line opacities in tokamak divertor plasmas under high-recycling and detached conditionsRay Chandra0Detlev Reiter1Niels Horsten2Mathias Groth3Aalto University, Espoo, 02150, Finland; Corresponding author.Institut for Laser and Plasmaphysics, Heinrich-Heine-Universität, Düsseldorf, GermanyKU Leuven, Department of Mechanical Engineering, Leuven, BelgiumAalto University, Espoo, 02150, FinlandRadiation transport simulations of the deuterium Lyman line series using EIRENE predict a factor of 2 increase of Balmer-α emission in the JET-ILW low confinement divertor plasmas in high-recycling and detached conditions caused by the re-absorption of Lyman-β emission. The photon tracing model in the EIRENE code is applied to SOLPS-ITER pure deuterium plasma solutions of JET-ILW to evaluate the contribution of Lyman-β capture towards the population density of D(p=3) and, consequently, the Balmer-α emission. The local population escape factors of Lyman-α and Lyman-β lines in the JET-ILW divertor show steep spatial gradients and indicate local regions with high opacity in high-recycling and detached conditions. The relative contribution of Lyman-β capture towards the population density of D(p=3) is significant in high-recycling and detached conditions. This observation is further corroborated by line-integrated calculations using Balmer-α diagnostic line-of-sights.http://www.sciencedirect.com/science/article/pii/S2352179124002175FusionRadiation transportLine radiationDivertorDetachmentCollisional-radiative |
| spellingShingle | Ray Chandra Detlev Reiter Niels Horsten Mathias Groth Lyman line opacities in tokamak divertor plasmas under high-recycling and detached conditions Nuclear Materials and Energy Fusion Radiation transport Line radiation Divertor Detachment Collisional-radiative |
| title | Lyman line opacities in tokamak divertor plasmas under high-recycling and detached conditions |
| title_full | Lyman line opacities in tokamak divertor plasmas under high-recycling and detached conditions |
| title_fullStr | Lyman line opacities in tokamak divertor plasmas under high-recycling and detached conditions |
| title_full_unstemmed | Lyman line opacities in tokamak divertor plasmas under high-recycling and detached conditions |
| title_short | Lyman line opacities in tokamak divertor plasmas under high-recycling and detached conditions |
| title_sort | lyman line opacities in tokamak divertor plasmas under high recycling and detached conditions |
| topic | Fusion Radiation transport Line radiation Divertor Detachment Collisional-radiative |
| url | http://www.sciencedirect.com/science/article/pii/S2352179124002175 |
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